Fluid-pressure percussive dridl



' E. W. STEVE'NS Filed Dec. 18. 1925 FLUID PRESSURE PERCUSSIVE DRILL INLVENTOR. Ca/ward W$euen5 May 8., 41 l Patented May 8, 1928.

N i Lassen unrr En srnir Parent oar-ree.; i

EDWARD w.' STEVENS, 0E Diemen- MICHIGAN; inissleiaon` TocHIcAGorNEUu-MIo d troon COMPANY;` 0E: NEW Yoan; Y=, A; confronn'rronf or NEW JERSEY.

Enum-PRESSURE PEEcnsswEf ni'nna `Aaliication iledmeeember 18g 1925. Serial No.A 76,2;78:`

This invention relates. to fluidf pressure toolset the percussivertype used-for mining,` `quarrying;v and similarf operations andiccmmonlyreferred to Casi rock drills.`

lwrlchiiiesA oif` the type" described provide some form ot mechanism ton-rotating the dri-ill steel.` rElieusiu1l.-arran gement` is fto produce rotation'of the hammerpiston as it rec iprocatesyand i to f transmit this i rotary motion` through certailr keyed parts to'ithe chuck in which i the shank of the dr-ill steel issuppsorted.`` The intense vibrationV develcped by certain parts of the machinevwhen the latterfiseinfoperation, particularly after the-parts havebecome son'iewliat worn, tends to produce crystallizationvvitlr the' resultthat brealmge occurs. A'Ilie par-ts thus suhjcct. to` ln'ealmge` require considerableY mav` chining and their replacement is i according,-

lyiaimatterof, considerableifcxpensei y Among thef `objects of i the-V invention are to reducefthe Abreakage ofi expensive parts `in machines of thetypef-described, tomnimize aud localiza the` effects `of:` vibration, l and in `aerieralto-imprimeprior devices in the interests otmore setisiactory service.- y

In order to illustrate the inventionone concrete embodiment thereof; is showin in the accompanying drawing iniwhich: i

Figi;r 1i. is a; longitudinal; sectional view through a portion of a fluid pressure percussive drill; and y Fig. 2 isa perspective viewof certain of the parts shown in Fig. l.

The preferred embodiment of'theinvention is shown in Fig. 1 which discloses in section somuch of a fluid pressure percussive drill as will serve to illustrate the invention. The drill therein shown comprises a cylinder 3 having a piston chamber in which reciprocates a hammer piston 4 in1- parting blows to a working tool or drill steel. 5 either directly or through a movable impact member in the form of an anvil i block 6 interposed between thev steelA 5 and vthe impact end 4 of the piston. The shank of the drill steel 5 is received in a chuck 7 mounted for rotative movement in a front head 8 secured to the drill cylinder 3 inany suitable manner (not shown). `The anvil block 6 is supported in a bushing 9 arranged for rotative movement in the drill cylinder 3, the bushing being keyed to the chuck 8 by any suitable means such as interengaging parts or teeth 7"l and 9 respectively. Bushxcheap andreadily renewable means are pro-` ing 9 isalso keyed in a similar manner te the guide sleeve l0 for the'impactxendf? of' the piston, sleeve l() having; grooves recarvingy splines 4i on-tlie piston. Anyl known or, desired meansmay be utilized for( im? partingL rotative movement to `piston fi` .such as the rifle bar 11 and the rilienut 12. i yThe rotativieql movement imparted by these last named parts-tothe piston 4 is transmittedthrouglisplines 4b tothesleeve 10, andfthen to the bushingI 9 and-to thechuek7, and-by thelatter tothe shankivof the drill-vsteelf; Since the anvil blocley 6- ismore or less looselandlthis-loosoness is increasedby wenn a1 viliiratoryonhammering,effect is produced by tliehcad 6` of the block uponi the abut tingr portions of chuck 7 and'bushingr 9l`com,-` prising particularly the `interengaggingoteeth 7 and 9a. In'A ord'errtopreventtcrystallizaf` tion and `breakage of these parts suitable vided for guiding and taking the wear of the head'- 6a." A1 preferred means for this piu-pose comprises a liner bushing 13 in telescoping relation withthe chuck 7 andthe bushing.` 9, having ai light press fit with the same,` l and coverinnfgthe` interitting` parts 7* and 9*?thereofl- Tith this construction any breakagireYinftha` front headL resulting;` from i the vibration 'ofthe anvil block i6 is confined to the liner 13V which is inexpensive as well as easy to renew. Moreover, the liner 13 beingr positioned opposite the joint between the cylinder 3 and the yfront head 8 serves to maintain the interengaged bushing 9 and chuck 7 in alignment and to reduce relative movement of the same. i

Inasmuch as the purpose of the present disclosure is illustrative only, it is to be uni dei-stood that the invention is not limited to the specific details thereof but covers all forms coming within the scope of the appended claims.

2. In a fluid pressure drill of the percussive type having a cylinder, a hammer piston reciprocable therein` a front head for said cylinder. a chuck in said head to receive the shank of the drill steel, an anvil block interposed between said piston and the drill steel, a bushing for said block in said cylinder, said chuck and said bushing being in abutting relation, and a liner bushing telescopingr within both said shank and said anvil bushing' and serving as a `guide for the head of the anvil block. Y

3. In a fluidv pressure drill of the percussive type having a cylinder, a hammer piston reciprocable therein, a front head for said C flinder, a chuck in said head to receive the s iank of the drill steel, an anvil block interposed between said piston and the drill. steel, a bushing' for said blockin said cylinder, means imparting rotation to said piston during its movementin one direction, means for transmitting the rotative movement o'i' said piston through said bushing to said chuck, and a liner bushing` in telescoping relation with both said chuck and said anvil bushing and servingr as a guido for the head of said anvil block.

fi. In a fluid pressure drill of the percussive type having a cylinder, a hammer piston reciprocable therein, a trout head for said cylinder, a chuck in said head to res ceive the shank ot the drill steel, an anvil block interposed between said piston and the drill steel, a` bushing` ior said block in said cylinder, means imparting rotation to said piston during its movement in one direction, and means including inter-engaging projections on said chuck and said bushing for transmitting such rotative movement to the drill steel, and a liner bushing covering the joint between said chuck and said anvil bushing taking the wear of the head of said anvil block.

ln a drill vof the percussive type, in combination, a member' arranged toV receive blows and transmit the same to a working tool, means for support-ing the working tool in position to be contacted by said member, a guide bushing for said member, and means in telescoping relation with said lirst-named means and with said bushing for maintainingr the same in alignment and foi-taking the wear of said member.

6. In a drill of the percussive type, in combination, a member arranged to receive blows and transmit the same to a working tool, said member having a head and a stem, a chuck for supportingr the working tool in position to be contacted by the head of said member, a guide bushing for the stem o' said member, and a liner bushing in inner telescoping relation with said chuck and said guide bushing' and arranged to take the wear of the head of said member.

T. ln a drill having a percussive motor in combination, an anvil block arranged'to receive the blows of the percussive motor and transmit the same to a working tool, said anvil block having'a head and a stem, a.V

chuck for supporting the shank of the working tool in position to be contacted by said head, a guide bushing for said stem, said bushing and said chuck being in abutting relation, and a liner bushing receiving the head ot said anvil block and in telescoping relation with both said chuck and said guide bushing.

Signed by me at Detroit, Michigan, this 15 day of December, 1925.

EDWARD W. STEVENS. 

